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A New Tool for Measuring Biosolids Floc Strength : WERF Research Report Series - M. Abu-Orf

A New Tool for Measuring Biosolids Floc Strength

WERF Research Report Series

Paperback

Published: 30th June 2004
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The ability to measure sludge network strength is important in sludge dewatering applications because it can be used to determine optimum polymer dose for conditioning to achieve good dewaterability. This was demonstrated in laboratory and in full-scale dewatering and thickening. The network strength increased as the polymer dose was increased, however, at the optimum dose a "drop" in the network strength occurred. Further research is needed to verify this concept at full scale and to provide a robust technology to the water and wastewater treatment industry. A second phase is sought through WERF funding. Rheometry was used for determining the sludge network strength. This report also formulated and demonstrated a standard protocol for measuring network strength in terms of energy dissipated in a certain volume of sludge. Two protocols for measuring network strengths by either torque or concentric cylinder rheometers are described in this report. A mathematical derivation has shown that area under rheograms, namely the curves which were developed by plotting shear rate (1/sec) versus shear stress (Pa) and time (sec) versus torque (mNm), indicated the rate of energy dissipation within the sludge system and the total dissipated energy was related to the network strength. The research did not intend to measure the "absolute" network strength, rather a comparative strength of different aggregates using the same instrument and under the same measuring conditions. Thus, the measured strength is relative. This publication can also be purchased and downloaded via Pay Per View on IWAP Water Intelligence Online

ISBN: 9781843397137
ISBN-10: 1843397137
Series: WERF Research Report Series
Audience: Professional
Format: Paperback
Language: English
Number Of Pages: 94
Published: 30th June 2004
Publisher: IWA Publishing
Country of Publication: GB
Dimensions (cm): 23.4 x 15.6  x 1.8
Weight (kg): 0.25